Glera is a white variety of grape of Slovenian origin, which was brought to village Prosecco (Slovene, Prosek) from Slovenian Kras. Glera was, until 2009, mostly referred to as Prosecco (Slovene, Prosekar).[1][2]

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Glera is believed to be an old variety, and its former name Prosecco was derived from the village Prosecco near Trieste, where the grape may have originated.[4] It has been proposed that it was cultivated already in Roman times,[5] possibly as the vinum pucinum praised by Pliny the Elder, although that is not known with any certainty. It ranks about thirtieth in importance among the country's some 2,000 grape varieties.[6]